Implement new register function for time based events, with ranges

[GregHilston]

We should allow a function of code to be registered for a time event, or range of time.

Basically imagine we wanted a function to execute every morning between x and y, we should make that easy to do.

It'd be help for periodic tasks like hitting an external API or reseeding some model or DB.

[GregHilston]

I'd love to be able to decorate with hours, minutes, seconds or cron syntax.